package servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import topicDao.MySqlTopicDao;
import topicDao.TopicEntity;

public class ToAddTopic extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public ToAddTopic() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request
	 *            the request send by the client to the server
	 * @param response
	 *            the response send by the server to the client
	 * @throws ServletException
	 *             if an error occurred
	 * @throws IOException
	 *             if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		this.doPost(request, response);
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

		response.setContentType("text/html;charset=utf-8");
		PrintWriter out = response.getWriter();

		request.setCharacterEncoding("utf-8");
		String tname = request.getParameter("tname");
		MySqlTopicDao td = new MySqlTopicDao();
		TopicEntity t = new TopicEntity(tname);
		int a = td.add(t);
		if (a > 0) {
			out.print("<script>alert('添加主题成功！');location.replace('addTopic.jsp');</script>");
		} else {
			out.print("<script>alert('添加主题失败！');history.back();</script>");
		}
		out.flush();
		out.close();
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException
	 *             if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}
